I am having the same type of problem with my venu 40, i have a magnum xl70 4 stroke mounted inverted and it sits a good 3/4 below the tank and it floods out also. the venus really doesnt have any room in the front to move the tank at all. i was thinking maybe to wrap the feul line that goes to the carb, around the fuel tank a time or two to maybe help stop the siphoning. any ideals would be great, thank you.